I wouldn’t use the word “tunnel-visioned”. That implies focused on something and ignoring the things nearby.
I think it’s more accurate to say “ignorant”. Many, probably most Americans just have no clue about most things outside the USA. You’ve travelled abroad, most Americans have not. The US is such an insular society that people can get away with saying things like “Canadians hate their healthcare” and people actually believe them.
I wouldn’t use the word “tunnel-visioned”. That implies focused on something and ignoring the things nearby.
I think it’s more accurate to say “ignorant”. Many, probably most Americans just have no clue about most things outside the USA. You’ve travelled abroad, most Americans have not. The US is such an insular society that people can get away with saying things like “Canadians hate their healthcare” and people actually believe them.